INTERLOCK CIRCUIT FOR PREVENTING CORRUPTION OF TELEPHONE LINE SIGNALS - Patent 0427800

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EP 0 427 800 A1

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(43)	Date of publication:
	22.05.1991 Bulletin 1991/21

(21)	Application number: 90903280.0

(22)	Date of filing: 31.01.1990

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International Patent Classification (IPC):

H04M 1/ 24^{( . )}
H04Q 1/ 44^{( . )}

H04M 3/ 30^{( . )}
H04Q 1/ 442^{( . )}

(86)	International application number:
	PCT/US1990/000602

(87)	International publication number:
	WO 1990/013959 (15.11.1990 Gazette 1990/26)

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB IT LI LU NL SE

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Priority:

28.04.1989 US 19890344401

(71)	Applicant: HARRIS CORPORATION
	Melbourne Florida 32912 (US)

(72)	Inventors:
	BENJAMIN, Dean, L. Ventura, CA 93004 (US) WONG, Wayne, K. Camarillo, CA 93010 (US)

(74)	Representative: Wilhelm & Dauster Patentanwälte European Patent Attorneys
	Hospitalstrasse 8 D-70174 Stuttgart D-70174 Stuttgart (DE)

(54)	INTERLOCK CIRCUIT FOR PREVENTING CORRUPTION OF TELEPHONE LINE SIGNALS